package org.finchley.study.config;


import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.cache.Cache;
import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.CachingConfigurerSupport;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.cache.interceptor.CacheErrorHandler;
import org.springframework.cache.interceptor.KeyGenerator;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.connection.RedisPassword;
import org.springframework.data.redis.connection.RedisStandaloneConfiguration;
import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;

import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;

/**
 * 使用的Redis缓存配置
 * @author John Fang
 *
 */
@Configuration
@EnableCaching
public class CacheConfig extends CachingConfigurerSupport {

/**
* Logger
*/
private static final Logger LOG = LoggerFactory.getLogger(CacheConfig.class);


@Autowired
private JedisConnectionFactory jedisConnectionFactory;

@Bean
@Override
public KeyGenerator keyGenerator() {
   //  设置自动key的生成规则，配置spring boot的注解，进行方法级别的缓存
   // 使用：进行分割，可以很多显示出层级关系
   // 这里其实就是new了一个KeyGenerator对象，只是这是lambda表达式的写法，我感觉很好用，大家感兴趣可以去了解下
   return (target, method, params) -> {
       StringBuilder sb = new StringBuilder();
       sb.append(target.getClass().getName());
       sb.append(":");
       sb.append(method.getName());
       for (Object obj : params) {
           sb.append(":" + String.valueOf(obj));
       }
       String rsToUse = String.valueOf(sb);
       LOG.info("自动生成Redis Key -> [{}]", rsToUse);
       return rsToUse;
   };
}

@Bean
@Override
public CacheManager cacheManager() {
   // 初始化缓存管理器，在这里我们可以缓存的整体过期时间什么的，我这里默认没有配置
   LOG.info("初始化 -> [{}]", "CacheManager RedisCacheManager Start");
   RedisCacheManager.RedisCacheManagerBuilder builder = RedisCacheManager
           .RedisCacheManagerBuilder
           .fromConnectionFactory(jedisConnectionFactory);
   return builder.build();
}

@Bean
public RedisTemplate<String, Object> redisTemplate(JedisConnectionFactory jedisConnectionFactory ) {
   //设置序列化
   Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<Object>(Object.class);
   ObjectMapper om = new ObjectMapper();
   om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
   om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
   jackson2JsonRedisSerializer.setObjectMapper(om);
   // 配置redisTemplate
   RedisTemplate<String, Object> redisTemplate = new RedisTemplate<String, Object>();
   redisTemplate.setConnectionFactory(jedisConnectionFactory);
   
   RedisSerializer<?> stringSerializer = new StringRedisSerializer();
   redisTemplate.setKeySerializer(stringSerializer); // key序列化
   redisTemplate.setValueSerializer(jackson2JsonRedisSerializer); // value序列化
   redisTemplate.setHashKeySerializer(stringSerializer); // Hash key序列化
   redisTemplate.setHashValueSerializer(jackson2JsonRedisSerializer); // Hash value序列化
   redisTemplate.afterPropertiesSet();
   return redisTemplate;
}

@Override
@Bean
public CacheErrorHandler errorHandler() {
   // 异常处理，当Redis发生异常时，打印日志，但是程序正常走
   LOG.info("初始化 -> [{}]", "Redis CacheErrorHandler");
   CacheErrorHandler cacheErrorHandler = new CacheErrorHandler() {
       @Override
       public void handleCacheGetError(RuntimeException e, Cache cache, Object key) {
           LOG.error("Redis occur handleCacheGetError：key -> [{}]", key, e);
       }

       @Override
       public void handleCachePutError(RuntimeException e, Cache cache, Object key, Object value) {
           LOG.error("Redis occur handleCachePutError：key -> [{}]；value -> [{}]", key, value, e);
       }

       @Override
       public void handleCacheEvictError(RuntimeException e, Cache cache, Object key)    {
           LOG.error("Redis occur handleCacheEvictError：key -> [{}]", key, e);
       }

       @Override
       public void handleCacheClearError(RuntimeException e, Cache cache) {
           LOG.error("Redis occur handleCacheClearError：", e);
       }
   };
   return cacheErrorHandler;
}

/**
* 此内部类就是把yml的配置数据，进行读取，创建JedisConnectionFactory和JedisPool，以供外部类初始化缓存管理器使用
* 不了解的同学可以去看@ConfigurationProperties和@Value的作用
*
*/
@ConfigurationProperties
class DataJedisProperties{
   @Value("${spring.redis.host}")
   private  String host;
   @Value("${spring.redis.password:''}")
   private  String password;
   @Value("${spring.redis.port}")
   private  int port;
   @Value("${spring.redis.timeout}")
   private  int timeout;
   @Value("${spring.redis.pool.max-idle}")
   private int maxIdle;
   @Value("${spring.redis.pool.max-wait}")
   private long maxWaitMillis;

   @Bean
   JedisConnectionFactory jedisConnectionFactory() {
       LOG.info("Create JedisConnectionFactory successful");
      
       RedisStandaloneConfiguration config = new RedisStandaloneConfiguration(host,port);
       if(password!=null && password.length()>0)
    	  config.setPassword(RedisPassword.of(password));
       else
    	   config.setPassword(RedisPassword.none());
     
      
       return new JedisConnectionFactory(config);
   }
   @Bean
   public JedisPool redisPoolFactory() {
       LOG.info("JedisPool init successful，host -> [{}]；port -> [{}]", host, port);
       JedisPoolConfig jedisPoolConfig = new JedisPoolConfig();
       jedisPoolConfig.setMaxIdle(maxIdle);
       jedisPoolConfig.setMaxWaitMillis(maxWaitMillis);
       if(password!=null && password.length()>0)
    	   return new JedisPool(jedisPoolConfig, host, port, timeout, password);
       else
    	   return new JedisPool(jedisPoolConfig, host, port);
   }
}

}
